Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A display device comprising: a pixel; and a driver circuit, wherein the pixel comprises a liquid crystal element, a first pixel circuit for driving the liquid crystal element, a light-emitting element, and a second pixel circuit for driving the light-emitting element, wherein the liquid crystal element comprises a reflective electrode having an opening and is configured to perform grayscale display by reflecting external light, wherein the light-emitting element is configured to perform grayscale display by emitting light through the opening, wherein the driver circuit comprises a receiving circuit, a controller, a switching control circuit, and a signal generation circuit, wherein the receiving circuit is configured to convert a differential signal of serial data into image data of parallel data and output the image data to the controller, wherein the signal generation circuit is configured to output a grayscale voltage for driving the liquid crystal element and a grayscale voltage for driving the light-emitting element in accordance with control with the controller, wherein the receiving circuit comprises an amplifier circuit for receiving the differential signal, wherein the differential signal comprises a first differential signal for driving the liquid crystal element and a second differential signal for driving the light-emitting element, wherein the amplifier circuit comprises a first amplifier circuit to which the first differential signal is input and a second amplifier circuit to which the second differential signal is input, wherein the amplifier circuit comprises a switch and a first transistor for supplying a bias current, wherein the switch is configured to control electrical continuity between a wiring for supplying a bias voltage and a gate of the first transistor, and wherein the switching control circuit is configured to output a switching signal for controlling electrical continuity of the switch in accordance with control with the controller.
A display device combines a reflective liquid crystal element and a light-emitting element within a single pixel to achieve high brightness and low power consumption. The liquid crystal element reflects external light for grayscale display, while the light-emitting element emits light through an opening in the reflective electrode, enabling dual-mode operation. The pixel includes a first circuit to drive the liquid crystal element and a second circuit to drive the light-emitting element. The driver circuit processes serial differential signals, converting them into parallel image data for display control. It includes a receiving circuit with separate amplifier circuits for handling differential signals dedicated to the liquid crystal and light-emitting elements. The amplifier circuits use a switch and a transistor to manage bias current, controlled by a switching signal from a switching control circuit. The controller coordinates the signal generation circuit to output appropriate grayscale voltages for both display elements. This design allows dynamic switching between reflective and emissive modes, optimizing power usage and brightness in varying lighting conditions. The system efficiently processes input signals and distributes control signals to ensure synchronized operation of both display elements.
2. The display device according to claim 1 , wherein the amplifier circuit comprises a first amplifier and a second amplifier.
A display device includes an amplifier circuit with a first amplifier and a second amplifier to enhance signal processing for improved display performance. The device addresses the challenge of maintaining high-quality image output under varying operating conditions, such as temperature fluctuations or power supply variations, which can degrade signal integrity. The first amplifier and second amplifier work together to amplify and condition input signals before they are processed by the display panel. This dual-amplifier configuration allows for better signal stability, reduced distortion, and improved dynamic range, ensuring consistent and high-fidelity visual output. The amplifiers may be configured to handle different aspects of the signal, such as gain control, noise reduction, or frequency response optimization, depending on the specific requirements of the display system. By incorporating this amplifier circuit, the display device achieves enhanced reliability and performance, particularly in demanding environments where signal integrity is critical. The design may also include additional components, such as feedback loops or adaptive control mechanisms, to further refine the amplification process and adapt to changing conditions. This approach ensures that the display maintains optimal performance across a wide range of scenarios.
3. The display device according to claim 1 , further comprising a sensor and a processor, wherein the sensor is configured to measure illuminance, and wherein the processor is configured to switch between, in accordance with the illuminance, a first mode for performing grayscale display with the liquid crystal element, a second mode for performing grayscale display with the liquid crystal element and the light-emitting element, and a third mode for performing grayscale display with the light-emitting element.
A display device includes a liquid crystal element and a light-emitting element, where the liquid crystal element modulates light from the light-emitting element to produce grayscale images. The device further includes a sensor and a processor. The sensor measures ambient illuminance, and the processor adjusts the display mode based on the measured illuminance. In a first mode, grayscale display is performed using only the liquid crystal element, blocking or transmitting ambient light without active illumination. In a second mode, grayscale display is achieved by combining the liquid crystal element with the light-emitting element, where the light-emitting element provides backlighting while the liquid crystal modulates the light. In a third mode, grayscale display is performed using only the light-emitting element, where the light-emitting element directly produces the grayscale image without the liquid crystal element. The processor dynamically switches between these modes to optimize display performance based on ambient lighting conditions, ensuring visibility and energy efficiency. The light-emitting element may be an organic light-emitting diode (OLED) or another emissive display technology, while the liquid crystal element may be a reflective or transmissive type. This configuration allows the display to adapt to different environments, such as bright sunlight or low-light conditions, by selecting the most appropriate display mode.
4. The display device according to claim 1 , wherein the first pixel circuit and the second pixel circuit each comprise a second transistor, and wherein the second transistor comprises a metal oxide in a semiconductor layer where a channel formation region is formed.
A display device includes a pixel circuit with a first pixel circuit and a second pixel circuit. Each pixel circuit contains a second transistor, which has a semiconductor layer where a channel formation region is formed. The semiconductor layer includes a metal oxide material. This design improves the performance and reliability of the transistor by utilizing metal oxide in the channel region, which enhances electron mobility and stability. The display device may be used in applications requiring high-resolution and efficient pixel control, such as OLED or LCD displays. The metal oxide semiconductor layer provides better electrical characteristics compared to traditional silicon-based transistors, leading to improved display quality and energy efficiency. The transistor structure ensures stable operation under varying voltage and temperature conditions, making it suitable for advanced display technologies. The use of metal oxide in the channel region also allows for flexible and lightweight display designs. This innovation addresses the need for high-performance, energy-efficient transistors in modern display devices, particularly in applications where space and power consumption are critical.
5. The display device according to claim 1 , wherein the switching signal comprises a first switching signal to be supplied to the first amplifier circuit and a second switching signal to be supplied to the second amplifier circuit.
A display device includes a first amplifier circuit and a second amplifier circuit, each configured to amplify a signal for driving a display element. The device also includes a switching circuit that generates a switching signal to control the operation of the amplifier circuits. The switching signal comprises a first switching signal for the first amplifier circuit and a second switching signal for the second amplifier circuit. The switching signals are used to selectively activate or deactivate the amplifier circuits, allowing the display device to adjust its power consumption or performance based on the display requirements. The amplifier circuits may be configured to amplify different types of signals, such as data signals or control signals, to drive the display elements. The switching circuit ensures that the amplifier circuits operate in a coordinated manner, preventing conflicts or interference between the amplified signals. This configuration improves the efficiency and reliability of the display device by dynamically managing the amplifier circuits based on the switching signals.
6. A display module comprising: the display device according to claim 1 ; and a touch panel.
A display module includes a display device and a touch panel. The display device features a substrate with a display region and a peripheral region, where the display region includes a plurality of pixels arranged in an array. Each pixel contains a light-emitting element and a pixel circuit for driving the light-emitting element. The pixel circuit includes a driving transistor, a switching transistor, and a storage capacitor. The driving transistor has a gate electrode, a source electrode, and a drain electrode, with the gate electrode connected to a scan line, the source electrode connected to a data line, and the drain electrode connected to the light-emitting element. The switching transistor controls the electrical connection between the data line and the driving transistor. The storage capacitor maintains the voltage applied to the gate electrode of the driving transistor. The peripheral region includes a scan driver circuit and a data driver circuit, where the scan driver circuit sequentially supplies scan signals to the scan lines, and the data driver circuit supplies data signals to the data lines. The touch panel is integrated with the display device, allowing for touch input detection. This configuration enables a compact, high-resolution display with integrated touch functionality, addressing the need for space-efficient, interactive display solutions.
7. An electronic device comprising: the display device according to claim 1 ; and an operation key or a battery.
An electronic device includes a display device and either an operation key or a battery. The display device features a display panel with a first substrate, a second substrate, and a liquid crystal layer between them. The first substrate has a first electrode, a second electrode, and a third electrode, where the first and second electrodes are electrically connected and the third electrode is electrically insulated from the first and second electrodes. The second substrate has a fourth electrode. The display device also includes a first alignment film on the first substrate, a second alignment film on the second substrate, and a liquid crystal layer between the substrates. The first alignment film has a first alignment treatment direction, and the second alignment film has a second alignment treatment direction that intersects the first direction. The device may also include a backlight unit positioned behind the display panel. The operation key or battery provides functionality or power to the electronic device. This configuration allows for improved display performance and control in electronic devices.
8. A display device comprising: a pixel comprising a liquid crystal element and a light-emitting element; a driver circuit; and a sensor configured to measure illuminance, wherein the driver circuit comprises a receiving circuit, a controller, and a switching control circuit, wherein the controller is configured to switch between, in accordance with the illuminance, a first mode for performing display with the liquid crystal element, a second mode for performing display with the liquid crystal element and the light-emitting element, and a third mode for performing display with the light-emitting element, wherein the receiving circuit is configured to convert a differential signal of serial data into image data of parallel data and output the image data to the controller, wherein the receiving circuit comprises an amplifier circuit for receiving the differential signal, wherein the differential signal comprises a first differential signal for driving the liquid crystal element and a second differential signal for driving the light-emitting element, wherein the amplifier circuit comprises a first amplifier circuit to which the first differential signal is input and a second amplifier circuit to which the second differential signal is input, wherein the amplifier circuit comprises a switch and a first transistor for supplying a bias current, wherein the switch is configured to control electrical continuity between a wiring for supplying a bias voltage and a gate of the first transistor, and wherein the switching control circuit is configured to output a switching signal for controlling electrical continuity of the switch in accordance with control with the controller.
A display device combines a liquid crystal element and a light-emitting element within each pixel to enhance display performance under varying lighting conditions. The device includes a driver circuit and a sensor that measures ambient illuminance. The driver circuit comprises a receiving circuit, a controller, and a switching control circuit. The controller adjusts the display mode based on illuminance, selecting between three modes: a first mode using only the liquid crystal element, a second mode combining both the liquid crystal element and the light-emitting element, and a third mode using only the light-emitting element. The receiving circuit converts a differential serial data signal into parallel image data for the controller. It includes an amplifier circuit with separate paths for differential signals driving the liquid crystal element and the light-emitting element. The amplifier circuit features a first amplifier for the liquid crystal signal and a second amplifier for the light-emitting signal. A switch and a transistor regulate bias current by controlling electrical continuity between a bias voltage wiring and the transistor's gate. The switching control circuit generates a switching signal to manage this continuity based on the controller's instructions. This design optimizes display quality by dynamically adapting to ambient light conditions while efficiently processing input signals.
9. The display device according to claim 8 , wherein the amplifier circuit comprises a first amplifier and a second amplifier.
A display device includes a display panel and a driving circuit configured to drive the display panel. The driving circuit includes an amplifier circuit that amplifies a signal to be provided to the display panel. The amplifier circuit comprises a first amplifier and a second amplifier. The first amplifier amplifies an input signal, and the second amplifier further amplifies the output of the first amplifier to produce a final amplified signal. This dual-stage amplification ensures that the signal provided to the display panel has sufficient strength and stability, improving display performance. The display device may also include a timing controller that generates control signals for the driving circuit, ensuring synchronized operation. The amplifier circuit may be integrated into the driving circuit or provided as a separate component. The use of two amplifiers in series allows for finer control over signal amplification, reducing distortion and noise while maintaining signal integrity. This configuration is particularly useful in high-resolution or high-refresh-rate displays where signal quality is critical. The display device may be used in various applications, including televisions, monitors, and mobile devices.
10. The display device according to claim 8 , wherein a first pixel circuit for driving the liquid crystal element and a second pixel circuit for driving the light-emitting element each comprise a second transistor, and wherein the second transistor comprises a metal oxide in a semiconductor layer where a channel formation region is formed.
A display device integrates both liquid crystal elements and light-emitting elements, such as organic light-emitting diodes (OLEDs), to enhance display performance. The device addresses challenges in achieving high brightness, efficiency, and reliability in displays that combine these technologies. The display includes a first pixel circuit for driving the liquid crystal element and a second pixel circuit for driving the light-emitting element. Each pixel circuit contains a second transistor, which serves as a drive transistor to control current flow. The second transistor features a semiconductor layer with a channel formation region made of a metal oxide. This metal oxide material improves transistor performance by providing high mobility, low leakage current, and stability, which are critical for precise control of the liquid crystal and light-emitting elements. The use of metal oxide in the channel region enhances the overall efficiency and lifespan of the display, making it suitable for high-resolution and high-brightness applications. The integration of these circuits allows the display to switch between liquid crystal and light-emitting modes, offering flexibility in display functionality. The metal oxide transistor design ensures reliable operation under varying conditions, addressing issues related to degradation and power consumption in conventional display technologies.
11. The display device according to claim 8 , wherein the switching signal comprises a first switching signal to be supplied to the first amplifier circuit and a second switching signal to be supplied to the second amplifier circuit.
A display device includes a first amplifier circuit and a second amplifier circuit, each configured to amplify a signal for driving a display element. The device also includes a switching circuit that generates a switching signal to control the operation of the first and second amplifier circuits. The switching signal comprises a first switching signal for the first amplifier circuit and a second switching signal for the second amplifier circuit. The switching signals are used to selectively activate or deactivate the amplifier circuits, allowing for efficient power management and improved display performance. The amplifier circuits may be configured to drive different types of display elements or different portions of a display panel, enabling flexible control over the display output. The switching circuit ensures that the amplifier circuits operate in synchronization with the display driving requirements, reducing power consumption and enhancing the overall efficiency of the display device. This configuration is particularly useful in high-resolution or high-dynamic-range displays where precise control of amplifier circuits is necessary to maintain image quality while minimizing energy usage.
12. A display module comprising: the display device according to claim 8 ; and a touch panel.
A display module includes a display device and a touch panel. The display device features a substrate with a display region and a peripheral region, where the display region includes a plurality of pixels and a plurality of signal lines connected to the pixels. The signal lines extend from the display region into the peripheral region. The display device also includes a plurality of signal pads in the peripheral region, each connected to a corresponding signal line. A plurality of signal lines in the peripheral region are arranged in a staggered pattern to reduce the width of the peripheral region. The touch panel is integrated with the display device, allowing for touch input detection. The staggered arrangement of signal lines optimizes space utilization in the peripheral region, enabling a narrower bezel design while maintaining reliable signal transmission. This configuration is particularly useful in compact electronic devices where minimizing the non-display area is critical. The touch panel may be a capacitive or resistive type, depending on the application. The overall design improves the visual appeal and usability of the device by maximizing the display area relative to the overall device footprint.
13. An electronic device comprising: the display device according to claim 8 ; and an operation key or a battery.
An electronic device includes a display device and either an operation key or a battery. The display device features a substrate with a first surface and a second surface, where the first surface has a first region and a second region. The first region includes a first electrode, a second electrode, and a light-emitting layer between them. The second region includes a first electrode, a second electrode, and a light-emitting layer between them, but the first electrode in the second region is electrically connected to the second electrode in the first region. The second surface of the substrate has a first electrode, a second electrode, and a light-emitting layer between them. The first electrode on the second surface is electrically connected to the second electrode in the second region of the first surface. The device also includes a first insulating layer covering the first electrode in the first region and a second insulating layer covering the second electrode in the second region. The first and second insulating layers are separated by a gap. The operation key or battery provides power or user input functionality to the device. This configuration allows for a compact, multi-layered display with efficient electrical connections and insulation between components.
14. A display device comprising: a pixel comprising a first display element and a second display element; and a driver circuit; wherein the driver circuit comprises a receiving circuit, a controller, and a switching control circuit, wherein the receiving circuit is configured to convert a differential signal of serial data into image data of parallel data and output the image data to the controller, wherein the receiving circuit comprises an amplifier circuit for receiving the differential signal, wherein the differential signal comprises a first differential signal for driving the first display element and a second differential signal for driving the second display element, wherein the amplifier circuit comprises a first amplifier circuit to which the first differential signal is input and a second amplifier circuit to which the second differential signal is input, wherein each of the first amplifier circuit and the second amplifier circuit comprises a switch and a first transistor for supplying a bias current, wherein the switch is configured to control electrical continuity between a wiring for supplying a bias voltage and a gate of the first transistor, and wherein the switching control circuit is configured to output a switching signal for controlling electrical continuity of the switch in accordance with control with the controller.
A display device includes a pixel with a first and second display element, and a driver circuit. The driver circuit has a receiving circuit, a controller, and a switching control circuit. The receiving circuit converts a differential signal of serial data into parallel image data for the controller. The differential signal includes a first differential signal for the first display element and a second differential signal for the second display element. The receiving circuit has an amplifier circuit with a first amplifier for the first differential signal and a second amplifier for the second differential signal. Each amplifier includes a switch and a first transistor for supplying bias current. The switch controls electrical continuity between a bias voltage wiring and the gate of the first transistor. The switching control circuit outputs a switching signal to control the switch based on the controller's instructions. This design allows for efficient differential signal processing and bias current management in the display driver circuit, improving signal integrity and power efficiency. The system is particularly useful in high-resolution displays requiring precise control of multiple display elements.
15. The display device according to claim 14 , further comprising a sensor and a processor, wherein the sensor is configured to measure illuminance, and wherein the processor is configured to switch between, in accordance with the illuminance, a first mode for performing grayscale display with the first display element, a second mode for performing grayscale display with the first display element and the second display element, and a third mode for performing grayscale display with the second display element.
A display device includes a first display element and a second display element, where the second display element is positioned to overlap the first display element. The device adjusts its display mode based on ambient light conditions. A sensor measures illuminance, and a processor selects one of three operating modes. In the first mode, grayscale display is performed using only the first display element. In the second mode, grayscale display is achieved using both the first and second display elements. In the third mode, grayscale display is performed using only the second display element. The second display element may be a reflective display, such as an electrophoretic display, while the first display element may be an emissive display, such as an organic light-emitting diode (OLED) display. The device dynamically switches between these modes to optimize power consumption and visibility under varying lighting conditions. The first display element may include a plurality of sub-pixels, each with a light-emitting layer and a color filter, while the second display element may include a plurality of sub-pixels with a reflective layer and a color filter. The processor controls the display elements to achieve the desired grayscale output in each mode.
16. The display device according to claim 14 , wherein a first pixel circuit for driving the first display element and a second pixel circuit for driving the second display element each comprise a second transistor, and wherein the second transistor comprises a metal oxide in a semiconductor layer where a channel formation region is formed.
This invention relates to display devices, specifically those with multiple display elements per pixel, such as color and monochrome elements. The problem addressed is improving the performance and reliability of such displays by optimizing the pixel circuits that drive these elements. The invention provides a display device with a first display element and a second display element in each pixel, where each display element is driven by a dedicated pixel circuit. Each pixel circuit includes a second transistor that contains a metal oxide in its semiconductor layer, specifically in the channel formation region. This metal oxide transistor is designed to enhance electrical characteristics, such as stability and switching efficiency, which are critical for high-quality display performance. The use of metal oxide in the channel formation region helps reduce leakage current and improve the transistor's reliability over time, addressing common issues in advanced display technologies. The invention ensures that both the first and second display elements within a pixel are driven by transistors with optimized metal oxide semiconductor layers, leading to consistent and efficient display operation. This approach is particularly useful in high-resolution or high-dynamic-range displays where precise control of each display element is essential.
17. The display device according to claim 14 , wherein the switching signal comprises a first switching signal to be supplied to the first amplifier circuit and a second switching signal to be supplied to the second amplifier circuit.
A display device includes a first amplifier circuit and a second amplifier circuit, each configured to amplify a signal for driving a display element. The device also includes a switching circuit that generates a switching signal to control the operation of the first and second amplifier circuits. The switching signal comprises a first switching signal for the first amplifier circuit and a second switching signal for the second amplifier circuit. The switching signals are used to selectively activate or deactivate the amplifier circuits, allowing for efficient power management and improved display performance. The amplifier circuits may be configured to drive different types of display elements or different portions of a display panel, enabling flexible control over the display output. The switching signals ensure that the amplifier circuits operate in synchronization with the display driving requirements, reducing power consumption and enhancing overall system efficiency. This configuration is particularly useful in high-resolution or high-dynamic-range displays where precise control of amplifier circuits is necessary to maintain image quality while minimizing energy usage.
18. A display module comprising: the display device according to claim 14 ; and a touch panel.
A display module integrates a display device with a touch panel to enhance user interaction. The display device includes a substrate with a pixel array, where each pixel contains a light-emitting element and a driving circuit. The driving circuit comprises a driving transistor, a storage capacitor, and a switching transistor. The storage capacitor is connected between the gate and source of the driving transistor to maintain a stable voltage, ensuring consistent brightness. The switching transistor controls the flow of current to the light-emitting element, which emits light based on the applied voltage. The touch panel overlays the display device, allowing users to interact with the screen by detecting touch inputs. This integration enables a compact, responsive display system suitable for smartphones, tablets, and other touch-enabled devices. The combination of the display device's efficient light emission and the touch panel's input detection provides a seamless user experience. The module's design ensures high brightness uniformity and touch accuracy, addressing challenges in display performance and user interface responsiveness.
19. An electronic device comprising: the display device according to claim 14 ; and an operation key or a battery.
An electronic device includes a display device and either an operation key or a battery. The display device features a display panel with a first substrate, a second substrate, and a liquid crystal layer between them. The first substrate has a first electrode, a second electrode, and a third electrode, where the first and second electrodes are connected to a first signal line, and the third electrode is connected to a second signal line. The second substrate has a fourth electrode and a fifth electrode, with the fourth electrode connected to a third signal line and the fifth electrode connected to a fourth signal line. The display panel also includes a first switching element connected to the first signal line and the first electrode, a second switching element connected to the second signal line and the third electrode, a third switching element connected to the third signal line and the fourth electrode, and a fourth switching element connected to the fourth signal line and the fifth electrode. The display device further includes a first signal line driver circuit connected to the first and second signal lines, a second signal line driver circuit connected to the third and fourth signal lines, and a control circuit that controls the first and second signal line driver circuits. The control circuit applies a first voltage to the first and second electrodes via the first signal line, a second voltage to the third electrode via the second signal line, a third voltage to the fourth electrode via the third signal line, and a fourth voltage to the fifth electrode via the fourth signal line. The liquid crystal layer is driven by an electric field generated between the first and second electrodes and the third electrode, as well as between the fourth and fifth electrodes. The
20. A display device comprising: a pixel comprising a first display element and a second display element; and a driver circuit, wherein the driver circuit comprises a receiving circuit, a controller, a signal generation circuit, and a switching control circuit, wherein the receiving circuit is configured to convert a first differential signal into first image data and output the first image data to the controller, wherein the receiving circuit is configured to convert a second differential signal into second image data and output the second image data to the controller, wherein the signal generation circuit is configured to output a voltage for driving the first display element and a voltage for driving the second display element in accordance with control with the controller, wherein the receiving circuit comprises a first amplifier circuit for receiving the first differential signal and a second amplifier circuit for receiving the second differential signal, wherein each of the first amplifier circuit and the second amplifier circuit comprises a switch and a first transistor for supplying a bias current, wherein the switch is configured to control electrical continuity between a wiring for supplying a bias voltage and a gate of the first transistor, and wherein the switching control circuit is configured to output a switching signal for controlling electrical continuity of the switch in accordance with control with the controller.
This invention relates to a display device with improved signal processing for driving multiple display elements within a pixel. The device addresses the challenge of efficiently managing differential signals to control distinct display elements, such as those in dual-element pixels, while minimizing power consumption and signal interference. The display device includes a pixel with a first and second display element, along with a driver circuit. The driver circuit comprises a receiving circuit, a controller, a signal generation circuit, and a switching control circuit. The receiving circuit converts first and second differential signals into first and second image data, respectively, and sends this data to the controller. The signal generation circuit then outputs voltages to drive the first and second display elements based on the controller's instructions. The receiving circuit features first and second amplifier circuits, each receiving a differential signal. Each amplifier circuit includes a switch and a first transistor for supplying bias current. The switch controls electrical continuity between a bias voltage wiring and the gate of the first transistor. The switching control circuit generates a switching signal to manage this continuity, ensuring efficient bias current control and reducing power loss. This design optimizes signal integrity and power efficiency in display devices with multi-element pixels.
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May 26, 2020
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